發(fā)布時(shí)間：2018-06-20 05:32

  本文選題：金屬鐵粉 + 磷酸鐵鋰　； 參考：《稀有金屬》2014年03期

【摘要】：以1~3μm金屬鐵粉和磷酸二氫鋰為原料,采用高溫固相法合成了無(wú)碳磷酸鐵鋰。通過(guò)X射線衍射(XRD),掃描電鏡(SEM)和電化學(xué)測(cè)試等方法對(duì)合成的磷酸鐵鋰材料的結(jié)構(gòu)、形貌和電化學(xué)性能進(jìn)行了表征。研究結(jié)果表明,采用1~3μm的金屬鐵粉和磷酸二氫鋰為原料,高溫固相法合成了具有橄欖石晶體結(jié)構(gòu)的磷酸鐵鋰材料,粉末近似球形,振實(shí)密度較高,一次顆粒200~300 nm。600℃合成的磷酸鐵鋰存在雜質(zhì)相,650~750℃下合成的磷酸鐵鋰具有完整的橄欖石晶體結(jié)構(gòu),產(chǎn)物為純相。無(wú)碳的磷酸鐵鋰呈淺灰色,600~750℃下合成的磷酸鐵鋰材料0.1C充放電存在平臺(tái),顯示兩相充放電特性,比容量均在100 mAh·g-1左右,且極化較大。用蔗糖對(duì)其進(jìn)行包覆改性得到碳包磷酸鐵鋰,其顏色呈黑色,改性后的磷酸鐵鋰電化學(xué)性能有了較大的提高,0.1C比容量達(dá)到了154 mAh·g-1,充電平臺(tái)和放電平臺(tái)之間的極化明顯降低,具有較好的循環(huán)穩(wěn)定性。
[Abstract]:The carbon-free lithium ferric phosphate was synthesized by high temperature solid state method with 1 渭 m iron powder and lithium dihydrogen phosphate as raw materials. The structure, morphology and electrochemical properties of the synthesized lithium ferric phosphate were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical measurement. The results show that lithium ferric phosphate with olivine crystal structure was synthesized by high temperature solid state method using 1 渭 m iron powder and lithium dihydrogen phosphate as raw materials. The lithium ferric phosphate synthesized by the primary particle at 200 nm.600 鈩，

本文編號(hào)：2043154